Make package views security invokers

What kind of change does this PR introduce?

Reverts https://github.com/supabase/dbdev/pull/89 on the public.package* views.

Currently, there are no RLS policies for the anon role on app.package* tables so when these views take on the permissions of the underlying tables, no packages are visible to unauthenticated clients.

This was originally not noticed because it isn't visible when logged in on database.dev.

Unauthenticated users see a blank home page (see screenshot) and are currently unable to pull from the registry using the supabase-dbdev in-database client, instead seeing an error

Failed to run sql query: "version" is a required argument

This PR re-enables the homepage to populate for anon users and re-enables the database client.

A better solution (for a later time) will be to create policies for the anon role and re-apply security_invoker=false to the views

supabase / dbdev

Make package views security invokers #92

What kind of change does this PR introduce?